Called the Bloomberg Billionaires Index, it's essentially a real-time version of the Forbes Billionaires List, which comes out annually (though some individual net worths are updated more frequently).

While the top three positions are the same on both lists, after that the rankings deviate significantly. Ikea founder Ingvar Kamprad ranks fourth on the Bloomberg index while he's at #162 on the Forbes list, largely because he says he isn't the owner of his company (though Bloomberg maintains he is).

Now find out how the rest of the billionaires fared in the rankings. Listed net worths are from the Bloomberg Billionaire Index as of this publishing date.

#4 Ingvar Kamprad

Kamprad, the founder of furniture retailer Ikea, ranks fourth on the Bloomberg index while he's at #162 on the Forbes list, largely because he says he isn't the owner of his company (though Bloomberg maintains he is).

In March, Forbes called Kamprad the year's biggest loser, saying he had lost $17 billion of his wealth after his lawyers produced documents saying he could not benefit from the funds of his Lichtenstein-based foundation.

#1 Carlos Slim Helu

Slim Helu came from humble beginnings. His father was an immigrant shoe maker and Slim built his fortune from almost nothing. And although he has billions now, friends say he wears cheap suits and prefers pen and paper to fancy computers.